I have been renting a house for the past year. recently the plumbing backed up into my family room. when they pulled my carpet back the cap that is supposed to seal the drain slid right off. it had never been sealed. I know that this is supposed to keep the sewer gases out of my home. I have been having severe headaches, I have had to have a catscan done, and take medicine every day. Could my headaches be caused from the sewer gases? Will this have any long term effects on my family?